I've been following the Hyperspin Project on UG and it is looking absolutely awesome. It's going to be around 2TB worth of torrent and will include almost every system up to PSX. Having the Amiga is going to be nice but personally I'd be using more for console and arcade games.

With the 4 basic quickstarts 95% of the games should work I recon. (OCS, ECS, AGA, CD32) No need for a frontend to do this.

WinUAE is actually not supported out of the box. I did some scripting to get it run properly with disk swapper support and all. The command line features of WinUAE are pretty powerfull, almost everything can be done with command line parameters.